May 2011: Usama bin Laden, leader of Al Qaeda, was shot during a U.S. commando operation at Abbottabad, a city just north of Islamabad, Pakistan.
June 2011: Fazul Abdullah Mohammed, Al Qaeda's most senior operative in East Africa and who planned the 1998 US embassy bombings in Kenya and Tanzania, was killed in Somalia.
June 2011: Ilyas Kashmir, Al Qaeda's military operations chief in Pakistan, was believed to have organized a 2006 suicide bombing against the U.S. consulate in Karachi that killed four people, including an American diplomat. He was killed by a U.S. drone. (Reuters)
August 2011: Abd al-Rahman, a Libyan who in the last year had taken over as Al Qaeda’s top operational planner, was killed by a drone strike. (AP Photo/National Counterterrorism Center)
Sept. 30: Anwar al-Awlaki, a U.S.-born cleric killed in Yemen, planned and directed attacks on U.S. interests as "chief of external operations" for Al Qaeda's Yemen-based wing. He was killed during a joint operation by CIA officials and the U.S. military. (AP)